本文關鍵詞：尾礦庫植物根系發(fā)育的分形特征及對植物鈾分布的影響　出處：《南華大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 分形結構 植物根系 分維數 鈾濃度 鈾尾礦

【摘要】：尾礦庫是一個長期潛在的放射性污染源,它的環(huán)境治理是各國所面臨的嚴峻問題,其中植物生態(tài)修復已成為學術界的熱點。植物修復對尾礦生態(tài)環(huán)境質量的改善具有重要的現(xiàn)實意義,因此放射性污染物與植物的相互作用也得到了重視。植物根系分維數與體內累積鈾含量關系的研究,可為植物修復的環(huán)境風險評價提供指導意義。本文以生長在尾礦之上的常見植物為研究對象,分析植物根系發(fā)育的分形特征,探究植物重量、長度與分維數之間的關系;研究尾礦庫植物根系發(fā)育的分形特征對植物鈾分布的影響關系,探尋適宜生長在尾礦庫環(huán)境且對鈾元素具有一定吸附優(yōu)勢的植物。本文得出結果如下:(1)茅草植物根系分維數介于1.3305到1.5214之間變化,小蓬草根系分維數介于1.25787到1.42802之間變化,碎米莎草根系分維數分別為1.44350和1.45141。生長在尾礦之上的茅草、小蓬草、碎米莎草植物的根系發(fā)育都具有典型的分形特征。茅草植物根系分維數對根系重量和長度有一定的影響關系,植物根系分形維數越高,植物根系長度以及重量也就越高。(2)在尾礦之上生長出來的茅草植物根系鈾濃度明顯高于生長于尾礦周邊環(huán)境的根系鈾濃度,說明尾礦庫周邊環(huán)境受污染影響較低。茅草和小蓬草體內鈾濃度的整體變化趨勢是隨著植物根系分維數的增長而增長。植物根系分維數越高,根系越發(fā)達復雜,植物體內富集的鈾元素越高。(3)茅草等四種植物根部鈾濃度都明顯高于莖和葉部位鈾濃度,甚至有些植物的根系鈾濃度是其他部位的上百倍。說明植物體內鈾元素主要分布在植物根系。四種植物中碎米莎草根部富集的鈾濃度最高,馬唐其次,說明碎米莎草與馬唐對鈾元素具有一定的吸附優(yōu)勢。
[Abstract]:Tailings reservoir is a long-term potential source of radioactive pollution, its environmental management is a serious problem facing countries. Among them, phytoecological restoration has become a hot spot in academic circles. Phytoremediation has important practical significance to improve the ecological environment quality of tailings. Therefore, the interaction between radioactive pollutants and plants has also been paid attention to. The relationship between the fractal dimension of plant roots and the accumulation of uranium in the body is studied. It can provide guidance for environmental risk assessment of phytoremediation. This paper takes common plants growing on tailings as the research object, analyzes the fractal characteristics of plant root development, and probes into plant weight. The relationship between length and fractal dimension; The effects of fractal characteristics of root system development on uranium distribution in tailings reservoir were studied. In this paper, the results are as follows: 1) the root fractal dimension of the plant varies from 1.3305 to 1.5214. The fractal dimension of the root line of Psorbium vulgaris ranged from 1.25787 to 1.42802, and the fractal dimension of the root system was 1.44350 and 1.45141.The root fractal dimension was 1.44350 and 1.45141.The root fractal dimension was 1.25787 to 1.42802, respectively. The root system development of Phaeopodium mongolicum and Cyperus mollissima had typical fractal characteristics. The fractal dimension of root system had a certain influence on the weight and length of root system, and the higher the fractal dimension of root system was. The higher the root length and weight of the plant, the higher the uranium concentration of the root system of the grass growing on the tailings was significantly higher than that of the roots growing in the surrounding environment of the tailings. The results showed that the environment around the tailings reservoir was less affected by the pollution. The overall change trend of uranium concentration in the plants was increasing with the increase of plant root fractal dimension. The higher the plant root fractal dimension, the more complex the root system developed. The higher the uranium content in the plant, the higher the uranium concentration in the roots of the four plants was significantly higher than that in the stems and leaves. Even some plants have hundreds of times more uranium in their roots than in other parts, indicating that uranium is mainly distributed in the roots of plants. The highest concentration of uranium is found in the roots of Cyperus crassifolia, followed by Cortex angustifolia. It is concluded that the sorption of uranium elements by seagrass and Carthopsis chinensis has a certain advantage.
【學位授予單位】：南華大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X751;X173;Q945

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本文編號：1395058